can't control boost

so my car is acting crazy. is not letting me go over or lower from 15-16psi. i already check for leaks
and nothing dont know what to do. need help

 

List of mods, mileage, duty: severe v.s. not, maintenance? if any? yada yada!

 

did u ever get tuned

 

mods:

full turbo back
vf22
turbo xs FMIC
AP V1 custom map for the vf22
K&N short ram intake
Forge manual boost controller
just replace all belts in the car

the car has 86,000

 

probably has something to do with it

 

got a custom map for the vf22 it was runing fine. this start happening right after my cluth started to give out 3 months ago

 

i try 3 boost controllers and the same

 

Did you try the stock BCS and have you reset the ecu recently?

 

no i havent try the stock bcs and yes i reset the ecu 1 week ago i have a front 02 sensor bad could that be it what driving me crazy is that it wont go over or lower from 15-16 psi

 

I'd try the front 02 sensor first, its really easy to swap out and is much more integral to the ECU than the rear, which is just used for comparison readings to see how effective the cats are.

Have you datalogged the car recently to see what the ECU is seeing differently? If everything is mechanically sound than its something with the tune, ECU, or sensors. Could even be the MAF reading air wrong . . .

 

I would guess, boost leak, boost control, possibly check the MAF with the short ram, if the 02 sensor is bad it could be contributing as well.

I had a boost situation recently and it turned out to be the waste gate. Top Speed started by checking for boost leaks: hoses, connectors, tmic, then the boost controller. We ended up at the turbo through the process of elimination. It turned out to that the waste gate wouldn't hold pressure. If you have the cash I would take it to TS and get it done right. Probably save you time, money and avoid more problems down the road.

I would check all the hoses connections for a boost leak first.

 

wont go over or lower from 15-16 psi ???? explain ? so is it stuck at 15-16 psi ?

connect the WG line to turbo outlet direct (no MBC) = if its still 15-16 then wg issue
if not than MBC. are the lines to the MBC connected correctly (even only 2 lines)


custom map ?
custom for which setup
what about the BOV ?

 

yes is tock on 15-16 psi. im runing a hks ssq bov full recirculated

and the map is for the vf22

 

your sure your gauge isnt just broken?

 

i had someone ride with me and check with the AP and it would only go up to 17 psi

 

Have you changed out anything since the tune? Added any new parts? If it is a manual boost controller, where is it located?

 

x2, It doesn't make sense to me that your boost won't go any lower than 15 PSI. That means the turbo is perpetually spooled up.

 

lol stuck at 16 psi. At least you wont have to worry about turbo lag.

 

I think he means it is supposed to be a higher boost level, like 19 or 20 and it is only hitting 16-17.

 

yea he's suppose to be boosting higher.

 

what a mess
need to describe issue better so you can get people to help

bov not able to close ?
MBC bad ?
are you sure no boost leak ? damage BOV gasket ?

 

ok so i try this ^^^ and i went down to 11 psi. so i guess is not the WG

 

is located close to the oem BCS on top closer to the turbo

 

How did you check it for boost leaks?

Try pulling the line off the wastegate and see if the boost goes over 15. Just be sure to let out of the gas if it does go over 15psi or else it could end up boosting 20+ psi and breaking something.

 

Is your MBC hooked up by itself with one line coming from the turbo to the MBC and then out of the mbc to the wastegate?

 

I have a good needle valve MBC I will sell you for $45 if you need one.

 

yep

 

im going to try this and check back on here

 

ok today out of nowhere i did a 4th gear pull and i hit 19 psi. any one knows how to do a boost leak test

 

bump:unamused:

 

LINK WITH PICTURES

 

You can also put it in the turbo inlet...probably easier that way.

Another link with this method